closed-circuit televisionCCTV (closed-circuit television) is a TV system in which signals are not publicly distributed but are monitored, primarily for surveillance and security purposes.
Voice over Internet Protocol (VoIP), is a technology that allows you to make voice calls using a broadband Internet connection instead of a regular (or analog) phone line.
Access control is a security measure which is put in place to regulate the individuals that can view, use, or have access to a restricted environment.
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